0.5(X-1)-0.3(X+2)=0.15*1.2 注意：方程两边同时乘以0.15
0.5X-0.5-0.3X-0.3*2=0.18
0.2X-1.1=0.18
0.2X=1.28
X=6.4
10(x-1)/3-10(x+2)/5=1.2
(x-1)/3-(x+2)/5=0.12
5(x-1)-3(x+2)=0.12*15
5x-5-3x-6=1.8
2x-11=1.8
2x=12.8
x=12.8/2
x=6.4
5x-5-3x-6=1.8
2x=12.8
x=6.4
-12.5
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